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In astronomy, geology, and paleontology, tya, sometimes also kya, is an
acronym for thousand years ago and is used as a unit of time to denote
length of time before the present. The once popular term 'kya' is replaced
in modern scientific literature with the SI unit ka (kiloannum).
See also
· annum
· Before Present
· Gya
· bya
· mya
Units of time
Kilo-annum
